Cup holder extension



FIG. 1 is a top, left side perspective view of a cup holder extension, showing my new design;

FIG. 2 is a right side elevation view of the cup holder extension;

FIG. 3 is a left side elevation view of the cup holder extension;

FIG. 4 is a front elevation view of the cup holder extension;

FIG. 5 is a rear elevation view of the cup holder extension;

FIG. 6 is a top plan view of the cup holder extension; and,

FIG. 7 is a bottom plan view of the cup holder extension. 

CLAIM The ornamental design for a cup holder extension, as shown and described. 